network – OpenVPN connection error: connection activation failed: source connection not found

This concerns Ubuntu 18.04 LTS.

The desktop environment of the XFCE4 GUI is installed.

After upgrading from 16.04 LTS to 18.04 LTS, my VPN connections, which previously worked, no longer work. I've set up PPTP and OpenVPN connections.

The netplan configuration is

ethernets:
enp1s0:
Address: []
        dhcp4: true
version 2

Please note that I have pretty much exhausted everything I can find on the Internet on this topic, but my knowledge and networking expertise at this level is limited.

With the desktop nm applet, the VPN connection elements are dimmed. By starting nm-applet with sudo, the elements seem active but do not respond.

I used nmcli.

nmcli con gives me

myOpenVPN 9439b05e-bc7e-419b-8679-95aa84394af2 vpn -

I notice that the column of the device is empty. Should it be?

Try

sudo nmcli c up myOpenVPN

Give me

Error: Failed to activate connection: Can not find source connection.

/ var / log / openvpn is empty

grep VPN / var / log / syslog 

Give me

/ etc / NetworkManager / system connections / myOpenVPN
(9439b05e-bc7e-419b-8679-95aa84394af2, "myOpenVPN") 15 Jun 14:55:21
mythserver02 NetworkManager[1961]: [1560576321.7239] verification:
op = "connection-activate" uuid = "9439b05e-bc7e-419b-8679-95aa84394af2"
name = "myOpenVPN" pid = 19429 uid = 0 result = "fail" reason = "Can not find
source connection.

"

journalctl -u NetworkManager.service

Jun 15 14:51:44 mythserver02 NetworkManager[1961]:
[1560576104.9623] authentication request error for
org.freedesktop.NetworkManager.reload: Authorization check failed:
Failed to open file "/ proc / 19299 / status": no such file or directory
Jun 15 14:51:44 mythserver02 NetworkManager[1961]:
[1560576104.9629] authentication request error for
org.freedesktop.NetworkManager.checkpoint-rollback: Authorization
check failed: Failed to open file "/ proc / 19299 / status": No such file
or directory Jun 15 14:51:44 mythserver02 NetworkManager[1961]:
[1560576104.9635] authentication request error for
org.freedesktop.NetworkManager.enable-disable-statistics:
Failed to check for permission: Failed to open file "/ proc / 19299 / status":
No file or directory of this type 15 Jun 14:51:44 mythserver02
Network Manager[1961]: [1560576104.9640] authentication request error
for org.freedesktop.NetworkManager.enable-disable-connectivity-check:
Failed to check for permission: Failed to open file "/ proc / 19299 / status":
No file or directory of this type 15 Jun 14:55:21 mythserver02
Network Manager[1961]: [1560576321.7239] verification:
op = "connection-activate" uuid = "9439b05e-bc7e-419b-8679-95aa84394af2"
name = "myOPenVPN" pid = 19429 uid = 0 result = "fail" reason = "Can not find
source connection. "

There is no / proc / 19222 – what is it?

Help. whoever?

Thank you

Firewalls – Brute Force Centralized Connection Detection Using Netflow Data

Is brute force connection detection possible with Netflow data?
With netflow data, you can check the number of incoming packets on a specific destination port (for the search flow). If the number is less than a service-specific threshold value (SSH, FTP, etc.), the source IP address may be considered an attacker.

Has anyone ever experienced it, or is there an alternative for establishing a centralized detection of brute force? It's about protecting a few hundred Linux hosts running different services (SSH, FTP, HTTP, SMTP, IMAP, POP3).

google cloud platform – Quota error when creating a connection to a private service

Try to create a private service connection on a vpc and get a quota error. The project ID mentioned in the error does not concern my project. So I guess it's the identifier of the Google-managed project that the vpc peer is intended for. The graphics for this quota on my project are empty.

Hoping that the Googlers troll it and spot it

Quota exceeded for quota metric – servicemanagement.googleapis.com/default_requests' and Limit DefaultRequestsPerMinutePerProject & # 39; of the service & # 39; servicemanagement.googleapis.com & # 39; for the consumer 's project number: 244648151629 & # 39;

get error Connection denied telnet and smtp

Hi,

I can not send email get error of smtp connection refused and telnet

[root@cpanel ~]# telnet localhost 25
To try :: 1 …
telnet: connect to address :: 1: connection refused
Try 127.0.0.1 …
telnet: connect to address 127.0.0.1: connection refused
[root@cpanel ~]#

wi fi – Prevents the phone from automatically connecting to a specific wifi connection, not to mention this connection

This feature I'm looking for exists on ROMU rom and samsung ROMs:

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Similar questions have already been asked:

As of 2015, this answer only concerns Samsung and MIUI roms.

Answers to this and this question (from 2013) offer workarounds.

An answer to this question suggested using the Wi-fi Ruller which, unfortunately, is no longer supported.

It seems that the questions are rather old and that a simple, direct and direct solution has not yet been found.

operating systems – Oracle linux 6.9 hangs after connection

I have installed Oracle Oracle Linux 6.9 on an IBM server. After restarting the server machine, it starts, after I started, I entered the login ID and password. After entering login, the mouse pointer crashes and nothing displays elements. I have restarted several times, but there is no change. I have replaced the hard drive with a new installation but no change.

Guide me please.
Thank you

unit – What is the "right way" to open a Websocket connection in WebGL?

The official Unity documentation states that to run websockets in the WebGL reader, you must use this plug-in on Asset Store. Unfortunately, if you follow this link, you will find that this asset is obsolete and no longer available, with no explanation as to why or how to replace it.

With this unavailable, how do I implement WebGL Websockets in my game?

proxy – The easiest way to use the internet connection of a raspberry pi with a surf stick

I want to use an internet connection from a Raspberry Pi connected to a surf stick in a different country to run tests.

enter the description of the image here
Until now, I am able to connect to the pi via ssh inverted and run some tests. But the tests are quite heavy and the PI plants very often. Now, I just want to use pi's Internet connection and run tests with a more powerful machine.

What is the easiest way to "proxy" the internet connection of the pi? I have read information on the use of squid on the ft and on the modification of the ports so that the internet provider of the surf stick does not block it. But I'm not sure that's the way to go.

What are the ways to make the Internet connection available for other machines?

dg.differential geometry – Existence of a $ A $ connection on a group of holomorphic lines $ L $, s.t $ F (A) = ( mathrm {deg} L) ​​ omega $

I'm reading this document and on page 67 he's saying that for any bundle of lines $ L $ on a Rieman surface there is a connection $ A $ whose curvature is
$$
F (A) = ( mathrm {deg} mbox {} L) omega,
$$

or $ omega $ is a positive form. Does anyone know how can I prove it without using arguments of algebraic geometry?

Remote connection to MySQL with public IP running on Ubuntu 18.04 VPS from PC

I'm trying to establish a connection between the MySQL database on VPS and my PC.

I have created a new mysql_server user with all the privileges.

enter the description of the image here

My active Internet connections on the server:

netstat -tl

enter the description of the image here

ps to | grep mysqld

enter the description of the image here

The problem is when I try to connect to the database from a PC

mysql -h servername -p 13799 -u sqql-server -pdeveloper

The error is:

ERROR 2003 (HY000): Can not connect to MySQL server on & # 39; server_ip & # 39; (61)

So I try to configure the database with:

sudo nano /etc/mysql/my.cnf

But I do not have links here, only 2 lines …

enter the description of the image here

What can I do?